Water-tube marine boiler.



PATENTED APR. 30, 1907.

I B.- BOTTIOHER. WATER TUBE MARINE BOILER.

APPLICATION FILED JUNE 25, 1906.

2 BHEETBSHEET 1.

0., wasnmcmn. n. c.

-No. 851,858. PATENTBD APR. 80, 1907; B BOTTIGHER WATER TUBE MARINE BOILER.

APPLICATION IILEDJ'UNE 25, 1906.

2 SHEETS-SHEET 2.

ERNST BOTTIOHER, OF KIEL, GERMANY.

WATER-=TUBE MARINE BOILER.

Specification of Letters Patent.

Patented April 30, 1907.

Application filed June 25,1906. Serial No. 323,278.

T0 at whom it may concern.-

Be it known that I, ERNST Bor'ricnnn, a subject of the German Emperor, and a resident of Kiel, Germany, have invented certain new and useful Improvements in ater- Tube Marine Boilers, of which the following is a specification.

This invention relates to marine boilers and especially to water tube marine boilers. Boilers of this kind are 'enerally subjected to a most heavy strain and the object of this in vention is to rovide a boiler of this kind wherein the fal ing or down tubes are arranged in such a manner that the circulation of Water is warranted as much as possible under all circumstances.

Another'object of the invention is to provide a marine water tube boiler wherein the heating gases are uniformly distributed and discharged so that an uniform combustion of the coal on the lire grate is obtained.

With these and other objects in view my invention consists in the arrangement and combination of parts hereinafter fully described and specifically pointed out in the appended claims.

In the annexed drawings: Figure 1 is a front elevation of a water tube boiler constructed according to the principles of the present invention, Fig. 2 is a vertical central section of same, Figs. 3 to 5 are horizontal sections on lines mn of Figs. 1 and 2. Fig. 6 is a front elevation view similar to Fig. l, of a modified form of boiler. Fig. 7is avertical central section of same, Fig. 8 is a horizontal section on line m n of Figs. 6 and 7. Fig. 9 is a front elevation of still. another form of boiler, Fig. 10 is a vertical central section of same, Fig. 11 is a horizontal section according to line mn of Figs. 9 and 10.

The Figs. 1- 5 of the drawings show a Water tube marine boiler composed of an upper boiler and four lower ones separated by fire-grates and connected by tube bundles with the upper boiler. While in the well known boilers of this kind only a small munber of down or falling tubes has been used for the circulation of the feed water introduced into the upper boiler and has been arranged at that place where the least heat is developed, a larger number of such tubes is used in the present boiler constructed according to the present invention and these tubes are uniformly distributed round the middle fire-grate i. e. at the places which are most exposed to the action of the heat. Furthermore the tubes facing the middle iiregrate are divided into groups having about each the same number of tubes the arrangement being such that of two neighboring groups one is formed by tubes serving for the production of steam while the other is composed of down or falling tubes. The latter are protected in the well known manner to the direct action of the heating gases by tube walls or by a cover formed of a suitable insulating material. Owing to this arrangement in groups those of the heating tubes which are exposed to the greatest heat are furnished with water from their immediate vicinity i. c. from the bundles of down tubes situated in their immediate neighborhood so that an interruption of the water supply is scarcely to be feared even when the strain is forced to the utmost.

The alternate distribution in groups of water circulation tubes and heating tubes united in tube bundles facing the middle part of the boiler allows furthermore of the' heating gases being evacuated in a more unifori'n manner on the entire length of the grate whereby a more uniform penetration of the air through the layer of coal and a more uniform combustion of the latter are secured, than for instance in boilers wherein closed ranges of down tubes are arranged on one side of the boiler so that the combustion gases only [ind a free way through the opposite side of the lire-grate.

The Figs. 1, 2 and 3 show a boiler composed of an upper boiler and four lower boilers separated one from the other by the iire grates a, b, and c, the lower boilers being connected with the upper one by the bundles of tubes (Z, c, f, and g. The outer bundles of tubes (Z and g only serve to generate steam, the bundles of tubes 0 and fserve by groups and alternately as heating tubes and as down or falling tubes, insuring circulation of water.

The Figs. 3, a and 5 show different arrangements of the bundles of down tubes, these bundles being distinguished by hatching and the way of the heating gases indicated by arrows.

The boiler shown in Figs. 6 and S is con.- structed according to the same principle; it on y differs from that shown in Figs. 1 to 5 in that there is only one fire-grate. Ilere also the tubes situated'on the side of the fire grate are alternately heating tubes and down or falling tubes while the outer groups of tubes are exclusively heating tubes.

In the form of boiler shown in Figs. 9 to 1 1 only two large bundles of tubes are provided between the lower boilers and the upper one, but the inner half of each of these bundles is divided into alternate groups of heating tubes and down or water tubes.

Having now fully described my said invention, what I claim and desire to secure by Letters Patent is:

1. In a water tube marine boiler the combination with an upper boiler, a fire grate and a plurality of lower boilers, of a plurality of tubes connecting the said lower and upper boilers, the bundles of tubes adjacent to the fire grate being alternately formed by groups of heating tubes and groups of down or water circulating tubes, substantially as and for the purpose set forth.

2. In a water tube marine boiler the combination with an upper boiler, a fire grate and a plurality of lower boilers, of a plurality of bundles of tubes connecting the lower boilers and the upper one, the bundles of tubes adthe outer bundles are completely formed by heating tubes, substantially as and for the purpose set forth.

3. In a water tube marine boiler the combination with an upper boiler, a plurality of fire-grates and a plurality of lower boilers, of bundles of tubes connecting the lower boilers and the upper one, the bundles of tubes adjacent to the middle fire grate being formed by alternating and adjacent groups of heating tubes and down or water circulating tubes, while the outer bundles are only formed by heating tubes, substantially as and for the purpose set forth.

In testimony whereof I have set hereunto my hand, in presence of two witnesses.

ERNST BOTTICHER.

Witnesses:

JULIUS RoYKE, ARNA THURAU. 

